Endress+Hauser PROline promass 83 II2G Manual page 62

0
<
26
Configuration example FISCO model
Fig. 10 shows the typical structure and the associated components. The field devices
are operated on a segment with the type of protection EEx ia. A galvanic isolator is used
for the transition to the area with explosion risk. Field devices with a lower power con-
sumption, such as the Cerabar S pressure gauge, are supplied via the two-wire line. In
contrast, the Promass 83 as a four-wire device must be supplied via an local power
supply.
0 - 10 bar
6
4
T
E
5
5
3
Fig. 22: Typical example of a bus connection with a fieldbus power supply
Power Repeater KLD2-PR-Ex1.IEC1 (Pepperl+Fuchs)
1 = DCS with integrated FOUNDATION Fieldbus H1 interface card
2 = fieldbus power supply acc. FISCO model, Power Repeater KLD2-PR-Ex1.IEC1 (Pepperl+Fuchs)
3 = Promass 83 bus devices for hazardous area
4 = terminator (T) = bus termination
5 = transducer supply
6 = Cerabar S bus devices for hazardous area
Functional considerations
Using the following procedure the functional considerations checks whether the desired
segment structure meets the basic requirements for transmission to the physical layer
in IEC 61158-2.
Step 1 – compilation of the functional characteristic values of the fieldbus components
x Fieldbus power supply according FISCO model, Power Repeater KLD2-PR-Ex1.IEC1
(Pepperl+Fuchs):
U = 12.8 V (power supply voltage)
S
I = 100 mA (power supply current)
S
x Fieldbus line:
Cable type A
44 : /km (effective resistance per unit length)
R =
WK
x Fieldbus device Promass 83:
I = 12 mA (basic current)
B
U = 9...32 V (perm. operating voltage)
B
I = 0 mA (fault current)
FDE
I = 0 (< I )
startup B
PROline Promass 83 FOUNDATION Fieldbus
0 - 10 bar 0 - 10 bar
6
E E
5
3
3
E X E X
6
580 m
T
E
2
5
3
Endress+Hauser
Fieldbus
Foundation
1